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## Summary While adding semantic error support to red-knot, I noticed duplicate diagnostics for code like this: ```py # error: [invalid-syntax] "cannot use an asynchronous comprehension outside of an asynchronous function on Python 3.9 (syntax was added in 3.11)" # error: [invalid-syntax] "`asynchronous comprehension` outside of an asynchronous function" [reveal_type(x) async for x in AsyncIterable()] ``` Beyond the duplication, the first error message doesn't make much sense because this syntax is _not_ allowed on Python 3.11 either. To fix this, this PR renames the `async-comprehension-outside-async-function` semantic syntax error to `async-comprehension-in-sync-comprehension` and fixes the rule to avoid applying outside of sync comprehensions at all. ## Test Plan New linter test demonstrating the false positive. The mdtests from my red-knot PR also reflect this change.